Staple holder for stapling machines



Dec. 28 1926. 1,612,228 H. SKREBBA STAPLE HOLDER FOR STAPLING MACHINES Filed Dec. 5, 1925 Patented Dec. 2-8, 19 26.

PATENT OFFICE.

HANS SKREBBA, OF LAHR, GERMANY.

STAPLE HOLDER FOR STAPLING MACHINES.

Application filed December 3, 1925, Serial No. 73,041, and in Germany November 9, 1925.

The staple holder for stapling machines forming the subject of the present invention comprises a yoke which is pivotally arranged on the underside of the stapling 5 head in an aperture thereof, said yoke being urged by the action of a spring-blade also attached to the underside of said stapling head in such a way that in its operative position it will remain forced upwardly and momentarily retain the staple discharged from the staple guiding channel, said yoke pressing against the underside of the back of the staple and said pressure being con tinued whilst the staple setting plunger forces the staple downwardly in the dis charge-channel, said yoke rotating about its axis and retaining the staple at the same time, the rotary movement thereof being de termined in such a way that it will disengage or liberate the staple only at the mo ment the latter has been moved with its back to the lower end of the staple discharging channel, whilst if the staple setting plunger is moved back untimely, that is before it has completely discharged the staple from the channel, said staple will be moved back to its initial position by the yoke through the action of the upwardly pressing spring.

T he particular advantage of said arrangement consists in that the yoke will accomplish exactly limited uniform movements, in contradistinction to a spring serving the same purpose and the movements of which will not always be uniform, and a comparatively strong and therefore perfectly acting pressure of the spring may be easily overcome upon the lowering of the setting plunger.

In the accompanying drawings I have il lustrated one preferred f rm of the staple holder, in these drawings:

Fig. 1 is a side elevation of the stapling head (in section on line A of Fig. 3 showing the front elevation thereof) with the staple holder in inoperative position.

Fig. 2 shows also a side elevation with the staple holder in the position it will assume after the lowering of the setting plunger,

that is after the completion of the stapling operation.

Fig. 3 is a front elevation of the stapling head with the staple holder in its inoperatlve position.

Pivotally arranged about a transverse axis 3 in a longitudinal groove in the stapling head 1 is the staple holding yoke 2, which is urged upwardly by the long armed spring blade 5, attached by means of a scr w to the end of the stapling head 1, in such a way that the staple 6 will be clamped against the end of the setting plunger 7. Upon the lowering of. the plunger 7 the staple will be clamped by this holding device against the plunger 7 until the movement thereof will be fully completed, that is, until the staple will be completely discharged from the staple discharging channel at the end of the complete stapling operation.

Should the setting movement be untimely interrupted the staple 6 will obviously be moved back to its initial position, so that a second staple cannot be discharged unless the first staple will be removed from the staple channel by the completion of the full setting movement of the staple setting plunger.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent, is:

A stapling machine having a head, a yoke pivotally arranged on the under side thereof, a setting plunger and a spring blade secured to the head remote from the yoke with its free end bearing beneath and having sliding connection with the yoke, said yoke serving under the influence of the spring blade to hold the staple against the setting plunger during substantially the full stroke of the latter and releasing the staple immediately prior to the completion of the setting move ment of the plunger, the spring through its sliding connection with. the yoke serving to maintain a substantially uniform pressure on the yoke throughout its full movement In testimony whereof I have hereunto F4! my hand.

HANS SKR-EBliji 

